JPopup and JTree Problem

Dear All, I am here with a very irritating problem. I have constructed an application with popup menu and a tree. Purpose of this application is to add a JTreeNode with the help of Popup menu. Its all methods and listeners are working fine but they are unable to add a new tree node. This will be a great help on my part as well for others like me to sort this problem. Code is under: Thank you, Imran